简介

公司有个需求就是需要实现在marker下面显示标题的名称，百度地图api里面这些东西都有，但是google查了一遍api，却没有找到，通过搜索发现了markerwithlabel这样一个组件，能够实现这样的一个功能，所以写一个博客来记录实现方式。

案例实现

首先，需要将组件代码引入，需要在引入google map下面紧接着引入，或者将代码放到一个函数内，以回调的方式调用。
然后，添加图标原来的方式是使用marker：

marker = new google.maps.Marker({position: {lat: tilt, lng: pan},icon: icon.src,...
});

现在需要修改为可以添加文本的MarkerWithLabel：

marker = new google.maps.MarkerWithLabel({position: {lat: tilt, lng: pan},labelContent:title, //需要显示的标题的内容labelAnchor: point, //当前标题基于marker左上角的偏移labelStyle:{ //标题的style样式color: "#fff",fontSize: "12px"},labelClass:"class", //支持直接绑定class名，将样式写在css里面icon: icon.src
});

这个库是基于marker的扩展，所以，marker的相关功能都支持！！！

markerwithlabel的js代码

       /*** @name MarkerWithLabel for V3* @version 1.1.8 [February 26, 2013]* @author Gary Little (inspired by code from Marc Ridey of Google).* @copyright Copyright 2012 Gary Little [gary at luxcentral.com]* @fileoverview MarkerWithLabel extends the Google Maps JavaScript API V3*  <code>google.maps.Marker</code> class.*  <p>*  MarkerWithLabel allows you to define markers with associated labels. As you would expect,*  if the marker is draggable, so too will be the label. In addition, a marker with a label*  responds to all mouse events in the same manner as a regular marker. It also fires mouse*  events and "property changed" events just as a regular marker would. Version 1.1 adds*  support for the raiseOnDrag feature introduced in API V3.3.*  <p>*  If you drag a marker by its label, you can cancel the drag and return the marker to its*  original position by pressing the <code>Esc</code> key. This doesn't work if you drag the marker*  itself because this feature is not (yet) supported in the <code>google.maps.Marker</code> class.*//*!** Licensed under the Apache License, Version 2.0 (the "License");* you may not use this file except in compliance with the License.* You may obtain a copy of the License at**       http://www.apache.org/licenses/LICENSE-2.0** Unless required by applicable law or agreed to in writing, software* distributed under the License is distributed on an "AS IS" BASIS,* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.* See the License for the specific language governing permissions and* limitations under the License.*//*jslint browser:true *//*global document,google *//*** @param {Function} childCtor Child class.* @param {Function} parentCtor Parent class.*/function inherits(childCtor, parentCtor) {/** @constructor */function tempCtor() {};tempCtor.prototype = parentCtor.prototype;childCtor.superClass_ = parentCtor.prototype;childCtor.prototype = new tempCtor();/** @override */childCtor.prototype.constructor = childCtor;}/*** This constructor creates a label and associates it with a marker.* It is for the private use of the MarkerWithLabel class.* @constructor* @param {Marker} marker The marker with which the label is to be associated.* @param {string} crossURL The URL of the cross image =.* @param {string} handCursor The URL of the hand cursor.* @private*/function MarkerLabel_(marker, crossURL, handCursorURL) {this.marker_ = marker;this.handCursorURL_ = marker.handCursorURL;this.labelDiv_ = document.createElement("div");this.labelDiv_.style.cssText = "position: absolute; overflow: hidden;";// Set up the DIV for handling mouse events in the label. This DIV forms a transparent veil// in the "overlayMouseTarget" pane, a veil that covers just the label. This is done so that// events can be captured even if the label is in the shadow of a google.maps.InfoWindow.// Code is included here to ensure the veil is always exactly the same size as the label.this.eventDiv_ = document.createElement("div");this.eventDiv_.style.cssText = this.labelDiv_.style.cssText;// This is needed for proper behavior on MSIE:this.eventDiv_.setAttribute("onselectstart", "return false;");this.eventDiv_.setAttribute("ondragstart", "return false;");// Get the DIV for the "X" to be displayed when the marker is raised.this.crossDiv_ = MarkerLabel_.getSharedCross(crossURL);}inherits(MarkerLabel_, google.maps.OverlayView);/*** Returns the DIV for the cross used when dragging a marker when the* raiseOnDrag parameter set to true. One cross is shared with all markers.* @param {string} crossURL The URL of the cross image =.* @private*/MarkerLabel_.getSharedCross = function (crossURL) {var div;if (typeof MarkerLabel_.getSharedCross.crossDiv === "undefined") {div = document.createElement("img");div.style.cssText = "position: absolute; z-index: 1000002; display: none;";// Hopefully Google never changes the standard "X" attributes:div.style.marginLeft = "-8px";div.style.marginTop = "-9px";div.src = crossURL;MarkerLabel_.getSharedCross.crossDiv = div;}return MarkerLabel_.getSharedCross.crossDiv;};/*** Adds the DIV representing the label to the DOM. This method is called* automatically when the marker's <code>setMap</code> method is called.* @private*/MarkerLabel_.prototype.onAdd = function () {var me = this;var cMouseIsDown = false;var cDraggingLabel = false;var cSavedZIndex;var cLatOffset, cLngOffset;var cIgnoreClick;var cRaiseEnabled;var cStartPosition;var cStartCenter;// Constants:var cRaiseOffset = 20;var cDraggingCursor = "url(" + this.handCursorURL_ + ")";// Stops all processing of an event.//var cAbortEvent = function (e) {if (e.preventDefault) {e.preventDefault();}e.cancelBubble = true;if (e.stopPropagation) {e.stopPropagation();}};var cStopBounce = function () {me.marker_.setAnimation(null);};this.getPanes().overlayImage.appendChild(this.labelDiv_);this.getPanes().overlayMouseTarget.appendChild(this.eventDiv_);// One cross is shared with all markers, so only add it once:if (typeof MarkerLabel_.getSharedCross.processed === "undefined") {this.getPanes().overlayImage.appendChild(this.crossDiv_);MarkerLabel_.getSharedCross.processed = true;}this.listeners_ = [google.maps.event.addDomListener(this.eventDiv_, "mouseover", function (e) {if (me.marker_.getDraggable() || me.marker_.getClickable()) {this.style.cursor = "pointer";google.maps.event.trigger(me.marker_, "mouseover", e);}}),google.maps.event.addDomListener(this.eventDiv_, "mouseout", function (e) {if ((me.marker_.getDraggable() || me.marker_.getClickable()) && !cDraggingLabel) {this.style.cursor = me.marker_.getCursor();google.maps.event.trigger(me.marker_, "mouseout", e);}}),google.maps.event.addDomListener(this.eventDiv_, "mousedown", function (e) {cDraggingLabel = false;if (me.marker_.getDraggable()) {cMouseIsDown = true;this.style.cursor = cDraggingCursor;}if (me.marker_.getDraggable() || me.marker_.getClickable()) {google.maps.event.trigger(me.marker_, "mousedown", e);cAbortEvent(e); // Prevent map pan when starting a drag on a label}}),google.maps.event.addDomListener(document, "mouseup", function (mEvent) {var position;if (cMouseIsDown) {cMouseIsDown = false;me.eventDiv_.style.cursor = "pointer";google.maps.event.trigger(me.marker_, "mouseup", mEvent);}if (cDraggingLabel) {if (cRaiseEnabled) { // Lower the marker & labelposition = me.getProjection().fromLatLngToDivPixel(me.marker_.getPosition());position.y += cRaiseOffset;me.marker_.setPosition(me.getProjection().fromDivPixelToLatLng(position));// This is not the same bouncing style as when the marker portion is dragged,// but it will have to do:try { // Will fail if running Google Maps API earlier than V3.3me.marker_.setAnimation(google.maps.Animation.BOUNCE);setTimeout(cStopBounce, 1406);} catch (e) {}}me.crossDiv_.style.display = "none";me.marker_.setZIndex(cSavedZIndex);cIgnoreClick = true; // Set flag to ignore the click event reported after a label dragcDraggingLabel = false;mEvent.latLng = me.marker_.getPosition();google.maps.event.trigger(me.marker_, "dragend", mEvent);}}),google.maps.event.addListener(me.marker_.getMap(), "mousemove", function (mEvent) {var position;if (cMouseIsDown) {if (cDraggingLabel) {// Change the reported location from the mouse position to the marker position:mEvent.latLng = new google.maps.LatLng(mEvent.latLng.lat() - cLatOffset, mEvent.latLng.lng() - cLngOffset);position = me.getProjection().fromLatLngToDivPixel(mEvent.latLng);if (cRaiseEnabled) {me.crossDiv_.style.left = position.x + "px";me.crossDiv_.style.top = position.y + "px";me.crossDiv_.style.display = "";position.y -= cRaiseOffset;}me.marker_.setPosition(me.getProjection().fromDivPixelToLatLng(position));if (cRaiseEnabled) { // Don't raise the veil; this hack needed to make MSIE act properlyme.eventDiv_.style.top = (position.y + cRaiseOffset) + "px";}google.maps.event.trigger(me.marker_, "drag", mEvent);} else {// Calculate offsets from the click point to the marker position:cLatOffset = mEvent.latLng.lat() - me.marker_.getPosition().lat();cLngOffset = mEvent.latLng.lng() - me.marker_.getPosition().lng();cSavedZIndex = me.marker_.getZIndex();cStartPosition = me.marker_.getPosition();cStartCenter = me.marker_.getMap().getCenter();cRaiseEnabled = me.marker_.get("raiseOnDrag");cDraggingLabel = true;me.marker_.setZIndex(1000000); // Moves the marker & label to the foreground during a dragmEvent.latLng = me.marker_.getPosition();google.maps.event.trigger(me.marker_, "dragstart", mEvent);}}}),google.maps.event.addDomListener(document, "keydown", function (e) {if (cDraggingLabel) {if (e.keyCode === 27) { // Esc keycRaiseEnabled = false;me.marker_.setPosition(cStartPosition);me.marker_.getMap().setCenter(cStartCenter);google.maps.event.trigger(document, "mouseup", e);}}}),google.maps.event.addDomListener(this.eventDiv_, "click", function (e) {if (me.marker_.getDraggable() || me.marker_.getClickable()) {if (cIgnoreClick) { // Ignore the click reported when a label drag endscIgnoreClick = false;} else {google.maps.event.trigger(me.marker_, "click", e);cAbortEvent(e); // Prevent click from being passed on to map}}}),google.maps.event.addDomListener(this.eventDiv_, "dblclick", function (e) {if (me.marker_.getDraggable() || me.marker_.getClickable()) {google.maps.event.trigger(me.marker_, "dblclick", e);cAbortEvent(e); // Prevent map zoom when double-clicking on a label}}),google.maps.event.addListener(this.marker_, "dragstart", function (mEvent) {if (!cDraggingLabel) {cRaiseEnabled = this.get("raiseOnDrag");}}),google.maps.event.addListener(this.marker_, "drag", function (mEvent) {if (!cDraggingLabel) {if (cRaiseEnabled) {me.setPosition(cRaiseOffset);// During a drag, the marker's z-index is temporarily set to 1000000 to// ensure it appears above all other markers. Also set the label's z-index// to 1000000 (plus or minus 1 depending on whether the label is supposed// to be above or below the marker).me.labelDiv_.style.zIndex = 1000000 + (this.get("labelInBackground") ? -1 : +1);}}}),google.maps.event.addListener(this.marker_, "dragend", function (mEvent) {if (!cDraggingLabel) {if (cRaiseEnabled) {me.setPosition(0); // Also restores z-index of label}}}),google.maps.event.addListener(this.marker_, "position_changed", function () {me.setPosition();}),google.maps.event.addListener(this.marker_, "zindex_changed", function () {me.setZIndex();}),google.maps.event.addListener(this.marker_, "visible_changed", function () {me.setVisible();}),google.maps.event.addListener(this.marker_, "labelvisible_changed", function () {me.setVisible();}),google.maps.event.addListener(this.marker_, "title_changed", function () {me.setTitle();}),google.maps.event.addListener(this.marker_, "labelcontent_changed", function () {me.setContent();}),google.maps.event.addListener(this.marker_, "labelanchor_changed", function () {me.setAnchor();}),google.maps.event.addListener(this.marker_, "labelclass_changed", function () {me.setStyles();}),google.maps.event.addListener(this.marker_, "labelstyle_changed", function () {me.setStyles();})];};/*** Removes the DIV for the label from the DOM. It also removes all event handlers.* This method is called automatically when the marker's <code>setMap(null)</code>* method is called.* @private*/MarkerLabel_.prototype.onRemove = function () {var i;this.labelDiv_.parentNode.removeChild(this.labelDiv_);this.eventDiv_.parentNode.removeChild(this.eventDiv_);// Remove event listeners:for (i = 0; i < this.listeners_.length; i++) {google.maps.event.removeListener(this.listeners_[i]);}};/*** Draws the label on the map.* @private*/MarkerLabel_.prototype.draw = function () {this.setContent();this.setTitle();this.setStyles();};/*** Sets the content of the label.* The content can be plain text or an HTML DOM node.* @private*/MarkerLabel_.prototype.setContent = function () {var content = this.marker_.get("labelContent");if (typeof content.nodeType === "undefined") {this.labelDiv_.innerHTML = content;this.eventDiv_.innerHTML = this.labelDiv_.innerHTML;} else {this.labelDiv_.innerHTML = ""; // Remove current contentthis.labelDiv_.appendChild(content);content = content.cloneNode(true);this.eventDiv_.appendChild(content);}};/*** Sets the content of the tool tip for the label. It is* always set to be the same as for the marker itself.* @private*/MarkerLabel_.prototype.setTitle = function () {this.eventDiv_.title = this.marker_.getTitle() || "";};/*** Sets the style of the label by setting the style sheet and applying* other specific styles requested.* @private*/MarkerLabel_.prototype.setStyles = function () {var i, labelStyle;// Apply style values from the style sheet defined in the labelClass parameter:this.labelDiv_.className = this.marker_.get("labelClass");this.eventDiv_.className = this.labelDiv_.className;// Clear existing inline style values:this.labelDiv_.style.cssText = "";this.eventDiv_.style.cssText = "";// Apply style values defined in the labelStyle parameter:labelStyle = this.marker_.get("labelStyle");for (i in labelStyle) {if (labelStyle.hasOwnProperty(i)) {this.labelDiv_.style[i] = labelStyle[i];this.eventDiv_.style[i] = labelStyle[i];}}this.setMandatoryStyles();};/*** Sets the mandatory styles to the DIV representing the label as well as to the* associated event DIV. This includes setting the DIV position, z-index, and visibility.* @private*/MarkerLabel_.prototype.setMandatoryStyles = function () {this.labelDiv_.style.position = "absolute";this.labelDiv_.style.overflow = "hidden";// Make sure the opacity setting causes the desired effect on MSIE:if (typeof this.labelDiv_.style.opacity !== "undefined" && this.labelDiv_.style.opacity !== "") {this.labelDiv_.style.MsFilter = "\"progid:DXImageTransform.Microsoft.Alpha(opacity=" + (this.labelDiv_.style.opacity * 100) + ")\"";this.labelDiv_.style.filter = "alpha(opacity=" + (this.labelDiv_.style.opacity * 100) + ")";}this.eventDiv_.style.position = this.labelDiv_.style.position;this.eventDiv_.style.overflow = this.labelDiv_.style.overflow;this.eventDiv_.style.opacity = 0.01; // Don't use 0; DIV won't be clickable on MSIEthis.eventDiv_.style.MsFilter = "\"progid:DXImageTransform.Microsoft.Alpha(opacity=1)\"";this.eventDiv_.style.filter = "alpha(opacity=1)"; // For MSIEthis.setAnchor();this.setPosition(); // This also updates z-index, if necessary.this.setVisible();};/*** Sets the anchor point of the label.* @private*/MarkerLabel_.prototype.setAnchor = function () {var anchor = this.marker_.get("labelAnchor");this.labelDiv_.style.marginLeft = -anchor.x + "px";this.labelDiv_.style.marginTop = -anchor.y + "px";this.eventDiv_.style.marginLeft = -anchor.x + "px";this.eventDiv_.style.marginTop = -anchor.y + "px";};/*** Sets the position of the label. The z-index is also updated, if necessary.* @private*/MarkerLabel_.prototype.setPosition = function (yOffset) {var position = this.getProjection().fromLatLngToDivPixel(this.marker_.getPosition());if (typeof yOffset === "undefined") {yOffset = 0;}this.labelDiv_.style.left = Math.round(position.x) + "px";this.labelDiv_.style.top = Math.round(position.y - yOffset) + "px";this.eventDiv_.style.left = this.labelDiv_.style.left;this.eventDiv_.style.top = this.labelDiv_.style.top;this.setZIndex();};/*** Sets the z-index of the label. If the marker's z-index property has not been defined, the z-index* of the label is set to the vertical coordinate of the label. This is in keeping with the default* stacking order for Google Maps: markers to the south are in front of markers to the north.* @private*/MarkerLabel_.prototype.setZIndex = function () {var zAdjust = (this.marker_.get("labelInBackground") ? -1 : +1);if (typeof this.marker_.getZIndex() === "undefined") {this.labelDiv_.style.zIndex = parseInt(this.labelDiv_.style.top, 10) + zAdjust;this.eventDiv_.style.zIndex = this.labelDiv_.style.zIndex;} else {this.labelDiv_.style.zIndex = this.marker_.getZIndex() + zAdjust;this.eventDiv_.style.zIndex = this.labelDiv_.style.zIndex;}};/*** Sets the visibility of the label. The label is visible only if the marker itself is* visible (i.e., its visible property is true) and the labelVisible property is true.* @private*/MarkerLabel_.prototype.setVisible = function () {if (this.marker_.get("labelVisible")) {this.labelDiv_.style.display = this.marker_.getVisible() ? "block" : "none";} else {this.labelDiv_.style.display = "none";}this.eventDiv_.style.display = this.labelDiv_.style.display;};/*** @name MarkerWithLabelOptions* @class This class represents the optional parameter passed to the {@link MarkerWithLabel} constructor.*  The properties available are the same as for <code>google.maps.Marker</code> with the addition*  of the properties listed below. To change any of these additional properties after the labeled*  marker has been created, call <code>google.maps.Marker.set(propertyName, propertyValue)</code>.*  <p>*  When any of these properties changes, a property changed event is fired. The names of these*  events are derived from the name of the property and are of the form <code>propertyname_changed</code>.*  For example, if the content of the label changes, a <code>labelcontent_changed</code> event*  is fired.*  <p>* @property {string|Node} [labelContent] The content of the label (plain text or an HTML DOM node).* @property {Point} [labelAnchor] By default, a label is drawn with its anchor point at (0,0) so*  that its top left corner is positioned at the anchor point of the associated marker. Use this*  property to change the anchor point of the label. For example, to center a 50px-wide label*  beneath a marker, specify a <code>labelAnchor</code> of <code>google.maps.Point(25, 0)</code>.*  (Note: x-values increase to the right and y-values increase to the top.)* @property {string} [labelClass] The name of the CSS class defining the styles for the label.*  Note that style values for <code>position</code>, <code>overflow</code>, <code>top</code>,*  <code>left</code>, <code>zIndex</code>, <code>display</code>, <code>marginLeft</code>, and*  <code>marginTop</code> are ignored; these styles are for internal use only.* @property {Object} [labelStyle] An object literal whose properties define specific CSS*  style values to be applied to the label. Style values defined here override those that may*  be defined in the <code>labelClass</code> style sheet. If this property is changed after the*  label has been created, all previously set styles (except those defined in the style sheet)*  are removed from the label before the new style values are applied.*  Note that style values for <code>position</code>, <code>overflow</code>, <code>top</code>,*  <code>left</code>, <code>zIndex</code>, <code>display</code>, <code>marginLeft</code>, and*  <code>marginTop</code> are ignored; these styles are for internal use only.* @property {boolean} [labelInBackground] A flag indicating whether a label that overlaps its*  associated marker should appear in the background (i.e., in a plane below the marker).*  The default is <code>false</code>, which causes the label to appear in the foreground.* @property {boolean} [labelVisible] A flag indicating whether the label is to be visible.*  The default is <code>true</code>. Note that even if <code>labelVisible</code> is*  <code>true</code>, the label will <i>not</i> be visible unless the associated marker is also*  visible (i.e., unless the marker's <code>visible</code> property is <code>true</code>).* @property {boolean} [raiseOnDrag] A flag indicating whether the label and marker are to be*  raised when the marker is dragged. The default is <code>true</code>. If a draggable marker is*  being created and a version of Google Maps API earlier than V3.3 is being used, this property*  must be set to <code>false</code>.* @property {boolean} [optimized] A flag indicating whether rendering is to be optimized for the*  marker. <b>Important: The optimized rendering technique is not supported by MarkerWithLabel,*  so the value of this parameter is always forced to <code>false</code>.* @property {string} [crossImage="http://maps.gstatic.com/intl/en_us/mapfiles/drag_cross_67_16.png"]*  The URL of the cross image to be displayed while dragging a marker.* @property {string} [handCursor="http://maps.gstatic.com/intl/en_us/mapfiles/closedhand_8_8.cur"]*  The URL of the cursor to be displayed while dragging a marker.*//*** Creates a MarkerWithLabel with the options specified in {@link MarkerWithLabelOptions}.* @constructor* @param {MarkerWithLabelOptions} [opt_options] The optional parameters.*/function MarkerWithLabel(opt_options) {opt_options = opt_options || {};opt_options.labelContent = opt_options.labelContent || "";opt_options.labelAnchor = opt_options.labelAnchor || new google.maps.Point(0, 0);opt_options.labelClass = opt_options.labelClass || "markerLabels";opt_options.labelStyle = opt_options.labelStyle || {};opt_options.labelInBackground = opt_options.labelInBackground || false;if (typeof opt_options.labelVisible === "undefined") {opt_options.labelVisible = true;}if (typeof opt_options.raiseOnDrag === "undefined") {opt_options.raiseOnDrag = true;}if (typeof opt_options.clickable === "undefined") {opt_options.clickable = true;}if (typeof opt_options.draggable === "undefined") {opt_options.draggable = false;}if (typeof opt_options.optimized === "undefined") {opt_options.optimized = false;}opt_options.crossImage = opt_options.crossImage || "http" + (document.location.protocol === "https:" ? "s" : "") + "://maps.gstatic.com/intl/en_us/mapfiles/drag_cross_67_16.png";opt_options.handCursor = opt_options.handCursor || "http" + (document.location.protocol === "https:" ? "s" : "") + "://maps.gstatic.com/intl/en_us/mapfiles/closedhand_8_8.cur";opt_options.optimized = false; // Optimized rendering is not supportedthis.label = new MarkerLabel_(this, opt_options.crossImage, opt_options.handCursor); // Bind the label to the marker// Call the parent constructor. It calls Marker.setValues to initialize, so all// the new parameters are conveniently saved and can be accessed with get/set.// Marker.set triggers a property changed event (called "propertyname_changed")// that the marker label listens for in order to react to state changes.google.maps.Marker.apply(this, arguments);}inherits(MarkerWithLabel, google.maps.Marker);/*** Overrides the standard Marker setMap function.* @param {Map} theMap The map to which the marker is to be added.* @private*/MarkerWithLabel.prototype.setMap = function (theMap) {// Call the inherited function...google.maps.Marker.prototype.setMap.apply(this, arguments);// ... then deal with the label:this.label.setMap(theMap);};google.maps.MarkerWithLabel = MarkerWithLabel;

参考

https://blog.csdn.net/daizi_xiao/article/details/37765173
https://www.cnblogs.com/boonya/p/3384720.html

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google map api v3 的marker使用label的方法(markerwithlabel的使用)

简介

案例实现

markerwithlabel的js代码

参考

google map api v3 的marker使用label的方法(markerwithlabel的使用)相关推荐

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